A remote, technical out-and-back through Wyoming's Bighorn Mountains
Bighorn Trail 100 Mile Endurance Run takes place on June 19, 2026 in Dayton, WY.
Bighorn Trail 100 Mile Endurance Run is 100 miles with 17,500 ft of elevation gain.
No — Bighorn Trail 100 Mile Endurance Run uses open registration; no lottery is required.
Yes, crew is allowed at Bighorn Trail 100 Mile Endurance Run. Sign in to Trailrace to see crew access for each aid station.
Yes, pacers are allowed at Bighorn Trail 100 Mile Endurance Run.
Yes, Bighorn Trail 100 Mile Endurance Run allows drop bags.
Bighorn Trail 100 Mile Endurance Run has 20 aid stations along the course.
The overall cutoff for Bighorn Trail 100 Mile Endurance Run is 35h. Per-aid-station cutoffs are available to signed-in Trailrace members.
Other trail races within 194 miles
A brutal out-and-back through the Bighorn National Forest of northeastern Wyoming, traversing remote canyons and ridgelines between Tongue Canyon and Jaws Trailhead. The course dishes out over 20,500 feet of climbing across 76 miles of technical singletrack, 16 miles of rugged jeep road, and 8 miles of gravel, with wildlife encounters ranging from elk and moose to the occasional rattlesnake. Consistently ranked among the ten toughest 100-milers in the country.
Some ultra experience recommended
Dayton, WY, United StatesJune 19, 2026
| Location | Mile | Elevation |
|---|---|---|
Start – Tongue Canyon Road Start | 0.0 | 4,275 ft |
Tongue River Trailhead Aid Station | 1.3 | 4,239 ft |
Lower Sheep Creek Aid Station | 3.5 | 5,023 ft |
Upper Sheep Creek Aid Station | 8.5 | 7,451 ft |
Dry Fork Ridge Aid Station | 13.5 | 7,480 ft |
Kearns Cow Camp Aid Station | 19.5 | 6,601 ft |
Bear Camp Aid Station | 26.5 | 6,801 ft |
Sally's Footbridge Aid Station | 30.0 | 4,590 ft |
Cathedral Rock Aid Station | 33.5 | 5,079 ft |
Spring Marsh Aid Station | 40.0 | 6,919 ft |
Jaws Trailhead Aid Station | 48.0 | 8,868 ft |
Spring Marsh Aid Station | 56.0 | 6,919 ft |
Cathedral Rock Aid Station | 62.5 | 5,079 ft |
Sally's Footbridge Aid Station | 66.0 | 4,590 ft |
Bear Camp Aid Station | 69.5 | 6,801 ft |
Kearns Cow Camp Aid Station | 76.5 | 6,601 ft |
Dry Fork Ridge Aid Station | 82.5 | 7,480 ft |
Upper Sheep Creek Aid Station | 87.5 | 7,451 ft |
Lower Sheep Creek Aid Station | 92.5 | 5,023 ft |
Tongue River Trailhead Aid Station | 94.8 | 4,239 ft |
Home Stretch Aid Station | 98.0 | 4,042 ft |
Scott Park Finish | 100.0 | 3,970 ft |
Sign in to see cutoffs, crew access, drop bags, and services for every aid station.
No dogs allowed on course except Tongue Canyon Road and River Rd.
Dogs must not be left in vehicles.
No pacer rules specified
No crew rules specified
No required gear specified
No recommended gear specified
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